#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkImplicitModeller.h>
#include <vtkSphereSource.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkContourFilter.h>
#include <vtkXMLPolyDataReader.h>

int main(int argc, char *argv[])
{
  vtkSmartPointer<vtkPolyData> inputPolyData;
  if(argc > 1)
    {
    vtkSmartPointer<vtkXMLPolyDataReader> reader =
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader->SetFileName(argv[1]);
    reader->Update();
    inputPolyData = reader->GetOutput();
    }
  else
    {
    vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->SetPhiResolution(15);
    sphereSource->SetThetaResolution(15);
    sphereSource->Update();
    inputPolyData = sphereSource->GetOutput();
    }
 
  vtkSmartPointer<vtkImplicitModeller> implicitModeller = 
    vtkSmartPointer<vtkImplicitModeller>::New();
  implicitModeller->SetSampleDimensions(50,50,50);
#if VTK_MAJOR_VERSION <= 5
  implicitModeller->SetInput(inputPolyData);
#else
  implicitModeller->SetInputData(inputPolyData);
#endif
  implicitModeller->AdjustBoundsOn();
  implicitModeller->SetAdjustDistance(.1); // Adjust by 10%
  implicitModeller->SetMaximumDistance(.1);
    
  // Compute the range to select a reasonable contour value
  double bounds[6];
  inputPolyData->GetBounds(bounds);
  double xrange = bounds[1] - bounds[0];

  // Create the 0 isosurface
  vtkSmartPointer<vtkContourFilter> contourFilter = 
    vtkSmartPointer<vtkContourFilter>::New();
  contourFilter->SetInputConnection(implicitModeller->GetOutputPort());
  contourFilter->SetValue(0, xrange/30.0); // 30% of xrange
    
  // Visualize
  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  
  vtkSmartPointer<vtkRenderWindowInteractor> interactor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
  
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(contourFilter->GetOutputPort());
  mapper->ScalarVisibilityOff();
  
  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  renderer->AddActor(actor);
  renderer->SetBackground(.1, .2, .3);
 
  renderWindow->Render();
  interactor->Start();
  
  return EXIT_SUCCESS;
}
